CA2048579A1 - Magnetic disk cartridge - Google Patents
Magnetic disk cartridgeInfo
- Publication number
- CA2048579A1 CA2048579A1 CA002048579A CA2048579A CA2048579A1 CA 2048579 A1 CA2048579 A1 CA 2048579A1 CA 002048579 A CA002048579 A CA 002048579A CA 2048579 A CA2048579 A CA 2048579A CA 2048579 A1 CA2048579 A1 CA 2048579A1
- Authority
- CA
- Canada
- Prior art keywords
- magnetic disk
- disk cartridge
- protrusions
- long protrusions
- cartridge according
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 230000008859 change Effects 0.000 abstract description 3
- 239000000428 dust Substances 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000004745 nonwoven fabric Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
- G11B23/50—Reconditioning of record carriers; Cleaning of record carriers ; Carrying-off electrostatic charges
- G11B23/505—Reconditioning of record carriers; Cleaning of record carriers ; Carrying-off electrostatic charges of disk carriers
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
- G11B23/02—Containers; Storing means both adapted to cooperate with the recording or reproducing means
- G11B23/03—Containers for flat record carriers
- G11B23/033—Containers for flat record carriers for flexible discs
- G11B23/0332—Containers for flat record carriers for flexible discs for single discs, e.g. envelopes
Landscapes
- Magnetic Record Carriers (AREA)
Abstract
Abstract A magnetic disk cartridge retains a rotational magnetic disk in a case through liners, which contact the associated surfaces of the disk and each have multiple long protrusions formed almost uniformly and almost in parallel to one another on the whole surface on the disk side. As the magnetic disk rotates, the angle of the disk surface contacting the long protrusions can gradually change, thus ensuring removal of dust from the disk. In addition, this structure can reduce the frictional resistance between the liner's surface and magnetic disk, which contributes to faster rotation of the disk.
Description
i7~3 The present invention relates to a magnetic disk cartridge which magnetically records and holds information.
A conventional magnetic disk cartridge is designed as follows.
In general, nonwoven fabric liners are adhered respectively to the inner surfaces of a separate type plastic cases, with a rotatable magnet:ic disk disposed therebetween in such a way that the surfaces of each liner may contact both sides of the magnetic disk. The liners each serve as claaning sheet and a prevention against abrasion of the magnetic disk surfaces.
The liner may be designed as disclosed in Japanese Unexamined Utility Model Publication No. Sho 63-52184 in such a manner as to have three long protrusions formed thereon protruding on the magnetic dislc side and extending radially.
With the use of such a liner, the long protrusions strongly contact with the magnetic disk to clean the disk ~0 surface while the other portion o~ the liner touches the disk very lightly, resulting in a small frictional resistance. The liners ~ill not interfere with the fast rotation of the magnetic disk.
Since the long protrusions on each liner of the conventional magnetic disk cartridge extend radially, however, when the magnetic disk rotates, the surface of the disk always contacts the radial long protrusions at almost the same angle. The contacting pattern does not therefore change, making the liners exert an insufficient effect to clean the magnetic disX.
In addition, to form the long protrusions radially on the liner, it is necessary to cut a rolled liner sheet in a disk shape before forming radial long protrusions on the cut liner by pressing, or after forming radial long protrusions on the liner sheet. In this method, centering of the disk shape liner is indispensable and therefore the st7~
productivity of magnetic disk cartridge will be remarkably reduced.
It is thsrefore an object of the present invention to provide a magnetic disk cartridge which can enhance the effect of cleaning a magnetic disk without interfering with the fast rotation of the disk. It is a further objec~ of the present invention to provide a magnetic disk cartridge with high productivity.
To achieve these objectives, a magnetic disk cartridge according to the present invention comprises a case, liners disposed in the case, and a magnetic disk accomodated rotatably in contact with surfaces of the liners in the case, the liners each having multiple long protrusions formed all over a surface on a magnetic disk side almost uniformly and almost in parallel to one another.
The protrusions may be formed to extend linearly.
It is preferable that at least one of the long protrusions passes a centre hole of each liner, or that at least one of the long protrusions contacts the center hole of the liner.
Xn addition, it is pre~erable that an interval between adjoining long protrusions be set smaller than a diameter of the center hole of each liner.
Further, it is also preferabla that the long protrusions be formed in a zigzag pattern in a plain parallel to the surface of the magnetic disk. The long protrusions may be formed in a sinusoidal or sawtooth pattern.
Furthermore, each long protrusion may be discontinuous. In this case, it is preferable that at least one substantial long protrusion portion is positioned on all rotational loci of the surface of the magnetic disk.
With any of the long protrusion patterns described above, it is possible to gradually change the angle of the disk surface contacting the long protrusions as the magnetic disk rotates. This can significantly improve the effect of 2~ 7~
dust removing. In addition, because other portions of the liner but the long protrusions lightly contact the magnetic disk, the frictional resistance to the magnetic disk can be r~duced, which contributes to faster rotation of the disk.
Accordingly, it is possible to provide a high-quality magnetic disk cartridge which can surely avoid a read/write error caused by dust.
In manufacturing a magnetic disk cartridgel a liner sheet with long protrusions uniformly formed thereon can be cut anywhere in a disk shape to provide liners without requiring the centering process mentioned above, thus resulting in higher productivity and lower manufacturing cost.
The structural features of the present invention and the action and effects based on the features will be apparent from the following description of the preferred embodiment in conj~mction with the accompanying drawings, in which Figure 1 is a ragmentary cross-section illustrating a magnetic disk cartridge according to one embodiment of the present invention;
Figure 2 is an exploded perspective view of the magnetic disk cartridge;
Figure 3 is a plan view illustrating a liner;
Figure 4 is a fragmentary cross-section illustrating the liner; and Figures 5 through 10 are plan views illustrating modifications of the linerO
A preferred embodiment of the present invention will now described referring to Figures 1 through 10.
As shown in Figures 1 and 2, a magnetic disk 1 has a hub 2 formed in its centre to rotate the disk and is retained in plastic cases 3 and 4 of a separate type.
Liners 5 and 6, respectively adhered to the inner walls of the cases 3 and 4, each have multiple linear long ;~3~
protrusions 7 for~ed in parallel and uniformly in its whole surface on the side of the maynetic disk 1, as shown in Figure 3.
Further, the liners 5 and 6 have gaps 9 provided where they correspond to head windows 8 of the cases 3 and 4, and have central openings 10 facing the hub 2 of the magnetic disk 1 A sliding shutter 11 opens and closes the head windows 8, and the cases 3 and 4 are ultrasonically fused together at their four corners.
The long protrusions 7 are determined according to their width W1 and height H, and the width W2 of the groove defined by the adjoining long protrusions. Through various experiments conducted, it was found that designing of the long protrusions 7 as follows could permit the magnetic disk to be efficiently cleaned and protected. The dimen~sions of the long protrusions 7 can vary regardless of presently available disk sizes, such as 3.5 inches, 5.25 inches and 8 inches. Figures in the parentheses are more preferable values.
Protrusion Width Wl: 1 to 10 mm (2 to 6 mm) Protrusion Height H: 0.3 to 2.0 mm (0.5 to 1.6 mm) Groove Width W2: 1 to 20 mm (2 to 10 mm) Too many protrusions 7 or the exceedingly high protrusions 7 would increase the rotational torque of the magnetic disk 1 and damage the magnetic disk 1. In general, as the width of the grooves, W2, (interval between the long protrusions) increases, it is better to set the height H of the protrusions greater. As the width W2 decreases, it is better to reduce the height H.
Such a width and height need to be determined in light of the material and thickness of the liners 5 and 6, the size of the magnetic disk 1, etc.
2~
Since the protrusions 7 are formed linear and parallel to one another as described above, the angla of the surface of the magnetic disk 1 contacting the individual protrusions 7 gradually varies in accordance with the rotation of the magnetic disk 1. Accordingly, the pattern of the magnetic disk l contacting the protrusions 7 can be changed, making it possible to surely clean the surfaces of tha magnetic disk 1.
More specifically, as shown in Figure 3, the magnetic disk 1 contacts a protrusion A among the protrusions 7 at almost right angles, but as the magnetic disk l contacts protrusions B, C and D its contact angle becomes more acute.
The magnetic disk 1 very lightly contacts the liners 5 and 6 where the protrusions 7 are not present (or the groove portions), allowing the magnetic disk l to rotate at a high spead~
To provide the linexs 5 and 6, a roll of a nonwoven fabric for liners, made of polyester or rayc~n texture, pressed on one side with a metal plate to form the protrusions 7 with predetermined size and density, is cut in almost disk shapes.
Compared with the conventional method for forming radial protrusions, this method requires no centering process in cutting the liners. Productivity therefore improves significantly, contributing to the reduction of tha manufacturing cost.
Figures 5 through 10 illustrate diffarant shapes of the liners 5 and 6 as modifications thereof.
As long as size and density of the long protrusions 7 extending in parallel are properly determined to efficiently clean and protsct the magnetic disk 1, the long protrusions 7 may be formed in any direction, lateral horizontal or diagonal. Further, the long protrusions 7 should not necessarily extend continuously. They may be formad discontinuous as shown in Figures 8 and 9 (indicated by S), or may be formed to be parallel sinusoidal waves as shown in Figure 10. The long protrusions may be formed in a sawtooth pattern instead of the sinusoidal one.
With those modified liners, it is possible to produce the same eEfects as acquired by the first type of produce the same effect as acquired by the first type of liners.
A conventional magnetic disk cartridge is designed as follows.
In general, nonwoven fabric liners are adhered respectively to the inner surfaces of a separate type plastic cases, with a rotatable magnet:ic disk disposed therebetween in such a way that the surfaces of each liner may contact both sides of the magnetic disk. The liners each serve as claaning sheet and a prevention against abrasion of the magnetic disk surfaces.
The liner may be designed as disclosed in Japanese Unexamined Utility Model Publication No. Sho 63-52184 in such a manner as to have three long protrusions formed thereon protruding on the magnetic dislc side and extending radially.
With the use of such a liner, the long protrusions strongly contact with the magnetic disk to clean the disk ~0 surface while the other portion o~ the liner touches the disk very lightly, resulting in a small frictional resistance. The liners ~ill not interfere with the fast rotation of the magnetic disk.
Since the long protrusions on each liner of the conventional magnetic disk cartridge extend radially, however, when the magnetic disk rotates, the surface of the disk always contacts the radial long protrusions at almost the same angle. The contacting pattern does not therefore change, making the liners exert an insufficient effect to clean the magnetic disX.
In addition, to form the long protrusions radially on the liner, it is necessary to cut a rolled liner sheet in a disk shape before forming radial long protrusions on the cut liner by pressing, or after forming radial long protrusions on the liner sheet. In this method, centering of the disk shape liner is indispensable and therefore the st7~
productivity of magnetic disk cartridge will be remarkably reduced.
It is thsrefore an object of the present invention to provide a magnetic disk cartridge which can enhance the effect of cleaning a magnetic disk without interfering with the fast rotation of the disk. It is a further objec~ of the present invention to provide a magnetic disk cartridge with high productivity.
To achieve these objectives, a magnetic disk cartridge according to the present invention comprises a case, liners disposed in the case, and a magnetic disk accomodated rotatably in contact with surfaces of the liners in the case, the liners each having multiple long protrusions formed all over a surface on a magnetic disk side almost uniformly and almost in parallel to one another.
The protrusions may be formed to extend linearly.
It is preferable that at least one of the long protrusions passes a centre hole of each liner, or that at least one of the long protrusions contacts the center hole of the liner.
Xn addition, it is pre~erable that an interval between adjoining long protrusions be set smaller than a diameter of the center hole of each liner.
Further, it is also preferabla that the long protrusions be formed in a zigzag pattern in a plain parallel to the surface of the magnetic disk. The long protrusions may be formed in a sinusoidal or sawtooth pattern.
Furthermore, each long protrusion may be discontinuous. In this case, it is preferable that at least one substantial long protrusion portion is positioned on all rotational loci of the surface of the magnetic disk.
With any of the long protrusion patterns described above, it is possible to gradually change the angle of the disk surface contacting the long protrusions as the magnetic disk rotates. This can significantly improve the effect of 2~ 7~
dust removing. In addition, because other portions of the liner but the long protrusions lightly contact the magnetic disk, the frictional resistance to the magnetic disk can be r~duced, which contributes to faster rotation of the disk.
Accordingly, it is possible to provide a high-quality magnetic disk cartridge which can surely avoid a read/write error caused by dust.
In manufacturing a magnetic disk cartridgel a liner sheet with long protrusions uniformly formed thereon can be cut anywhere in a disk shape to provide liners without requiring the centering process mentioned above, thus resulting in higher productivity and lower manufacturing cost.
The structural features of the present invention and the action and effects based on the features will be apparent from the following description of the preferred embodiment in conj~mction with the accompanying drawings, in which Figure 1 is a ragmentary cross-section illustrating a magnetic disk cartridge according to one embodiment of the present invention;
Figure 2 is an exploded perspective view of the magnetic disk cartridge;
Figure 3 is a plan view illustrating a liner;
Figure 4 is a fragmentary cross-section illustrating the liner; and Figures 5 through 10 are plan views illustrating modifications of the linerO
A preferred embodiment of the present invention will now described referring to Figures 1 through 10.
As shown in Figures 1 and 2, a magnetic disk 1 has a hub 2 formed in its centre to rotate the disk and is retained in plastic cases 3 and 4 of a separate type.
Liners 5 and 6, respectively adhered to the inner walls of the cases 3 and 4, each have multiple linear long ;~3~
protrusions 7 for~ed in parallel and uniformly in its whole surface on the side of the maynetic disk 1, as shown in Figure 3.
Further, the liners 5 and 6 have gaps 9 provided where they correspond to head windows 8 of the cases 3 and 4, and have central openings 10 facing the hub 2 of the magnetic disk 1 A sliding shutter 11 opens and closes the head windows 8, and the cases 3 and 4 are ultrasonically fused together at their four corners.
The long protrusions 7 are determined according to their width W1 and height H, and the width W2 of the groove defined by the adjoining long protrusions. Through various experiments conducted, it was found that designing of the long protrusions 7 as follows could permit the magnetic disk to be efficiently cleaned and protected. The dimen~sions of the long protrusions 7 can vary regardless of presently available disk sizes, such as 3.5 inches, 5.25 inches and 8 inches. Figures in the parentheses are more preferable values.
Protrusion Width Wl: 1 to 10 mm (2 to 6 mm) Protrusion Height H: 0.3 to 2.0 mm (0.5 to 1.6 mm) Groove Width W2: 1 to 20 mm (2 to 10 mm) Too many protrusions 7 or the exceedingly high protrusions 7 would increase the rotational torque of the magnetic disk 1 and damage the magnetic disk 1. In general, as the width of the grooves, W2, (interval between the long protrusions) increases, it is better to set the height H of the protrusions greater. As the width W2 decreases, it is better to reduce the height H.
Such a width and height need to be determined in light of the material and thickness of the liners 5 and 6, the size of the magnetic disk 1, etc.
2~
Since the protrusions 7 are formed linear and parallel to one another as described above, the angla of the surface of the magnetic disk 1 contacting the individual protrusions 7 gradually varies in accordance with the rotation of the magnetic disk 1. Accordingly, the pattern of the magnetic disk l contacting the protrusions 7 can be changed, making it possible to surely clean the surfaces of tha magnetic disk 1.
More specifically, as shown in Figure 3, the magnetic disk 1 contacts a protrusion A among the protrusions 7 at almost right angles, but as the magnetic disk l contacts protrusions B, C and D its contact angle becomes more acute.
The magnetic disk 1 very lightly contacts the liners 5 and 6 where the protrusions 7 are not present (or the groove portions), allowing the magnetic disk l to rotate at a high spead~
To provide the linexs 5 and 6, a roll of a nonwoven fabric for liners, made of polyester or rayc~n texture, pressed on one side with a metal plate to form the protrusions 7 with predetermined size and density, is cut in almost disk shapes.
Compared with the conventional method for forming radial protrusions, this method requires no centering process in cutting the liners. Productivity therefore improves significantly, contributing to the reduction of tha manufacturing cost.
Figures 5 through 10 illustrate diffarant shapes of the liners 5 and 6 as modifications thereof.
As long as size and density of the long protrusions 7 extending in parallel are properly determined to efficiently clean and protsct the magnetic disk 1, the long protrusions 7 may be formed in any direction, lateral horizontal or diagonal. Further, the long protrusions 7 should not necessarily extend continuously. They may be formad discontinuous as shown in Figures 8 and 9 (indicated by S), or may be formed to be parallel sinusoidal waves as shown in Figure 10. The long protrusions may be formed in a sawtooth pattern instead of the sinusoidal one.
With those modified liners, it is possible to produce the same eEfects as acquired by the first type of produce the same effect as acquired by the first type of liners.
Claims (10)
1. A magnetic disk cartridge comprising a case;
liners disposed in the case; and a magnetic disk accomodated rotatably in contact with surfaces of the liners in the case;
the liners each having multiple long protrusions formed all over a surface on a magnetic disk side almost uniformly and almost in parallel to one another.
liners disposed in the case; and a magnetic disk accomodated rotatably in contact with surfaces of the liners in the case;
the liners each having multiple long protrusions formed all over a surface on a magnetic disk side almost uniformly and almost in parallel to one another.
2. A magnetic disk cartridge according to claim 1, wherein the protrusions extend linearly.
3. A magnetic disk cartridge according to claim 1, wherein at least one of the long protrusions passes a centre hole of each liner.
4. A magnetic disk cartridge according to claim 1, wherein at least one of the long protrusions contacts a center hole of each liner.
5. A magnetic disk cartridge according to claim 1, wherein an interval between adjoining long protrusions is set smaller than a diameter of a centre hole of each liners.
6. A magnetic disk cartridge according to claim 1, wherein the long protrusions are formed in a zigzag pattern in a plain parallel to an associated surface of the magnetic disk.
7. A magnetic disk cartridge according to claim 6, wherein the long protrusions are formed sinusoidal.
8. A magnetic disk cartridge according to claim 6, wherein the long protrusions are formed in a sawtooth pattern.
9. A magnetic disk cartridge according to claim 1, wherein the long protrusions are each discontinuous.
10. A magnetic disk cartridge according to claim 9, wherein at least one substantial long protrusion portion is positioned on all rotational loci of a surface of the magnetic disk.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2-83253 | 1990-08-08 | ||
| JP1990083253U JPH0445382U (en) | 1990-08-08 | 1990-08-08 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2048579A1 true CA2048579A1 (en) | 1992-02-09 |
Family
ID=13797175
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002048579A Abandoned CA2048579A1 (en) | 1990-08-08 | 1991-08-07 | Magnetic disk cartridge |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US5282106A (en) |
| JP (1) | JPH0445382U (en) |
| CA (1) | CA2048579A1 (en) |
| DE (1) | DE4126304A1 (en) |
| GB (1) | GB2246903A (en) |
Families Citing this family (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR940024692A (en) * | 1993-04-02 | 1994-11-18 | 게리 릴 그리스월드 | Diskette liner with rim |
| US5615070A (en) * | 1994-07-14 | 1997-03-25 | Nomai Sa | Self-cleaning high-capacity, removable hard cartridge disk |
| USD370009S (en) | 1994-09-18 | 1996-05-21 | Iomega Corporation | Computer memory disk cartridge |
| US6317292B1 (en) | 1994-10-18 | 2001-11-13 | Iomega Corporation | PTFE fiber based liner for flexible high density magnetic media |
| JPH10507564A (en) * | 1994-10-18 | 1998-07-21 | アイオメガ コーポレイション | Disk cartridge having a brushed liner |
| JPH08221930A (en) * | 1995-02-17 | 1996-08-30 | Fuji Photo Film Co Ltd | Magnetic disk cartridge and its production |
| US5812351A (en) * | 1995-09-15 | 1998-09-22 | Imation Corp. | Raised-region having sloped edges under cleaning fabric in flexible magnetic recording diskette cartridge cover shell |
| US5980791A (en) * | 1996-07-17 | 1999-11-09 | Imation Corp. | Method for forming a molded-in lifter for cleaning a flexible magnetic disc |
| EP0918330A4 (en) * | 1996-08-08 | 2000-03-22 | Fuji Photo Film Co Ltd | Magnetic disk cartridge and method for manufacturing the same |
| JPH10340558A (en) * | 1997-06-06 | 1998-12-22 | Sony Corp | Disk cartridge |
| USD411533S (en) | 1998-05-12 | 1999-06-29 | Castlewood Systems, Inc. | Element of an audio video and computer data cartridge |
| USD418828S (en) * | 1998-05-12 | 2000-01-11 | Castlewood Systems, Inc. | Element of an audio, video and computer data cartridge |
| USD410644S (en) | 1998-05-12 | 1999-06-08 | Castlewood Systems, Inc. | Audio, video, and computer data cartridge |
| USD424048S (en) * | 1998-05-12 | 2000-05-02 | Castlewood Systems, Inc. | Video and computer data cartridge |
| KR100820970B1 (en) * | 1999-01-23 | 2008-04-10 | 엘지전자 주식회사 | Disc cartridge and manufacturing method thereof |
| JP2004030705A (en) * | 2002-06-21 | 2004-01-29 | Fuji Photo Film Co Ltd | Magnetic disk cartridge |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4096012A (en) * | 1976-08-30 | 1978-06-20 | The Boeing Company | Method of forming a spar layup for an aerodynamic rotor blade |
| GB2100048B (en) * | 1981-05-30 | 1985-08-21 | Sony Corp | Cleaning flexible magnetic disc cassettes |
| US4737876A (en) * | 1983-05-19 | 1988-04-12 | Verbatim Corporation | Write protect device for a record disk assembly |
| JPS6070981U (en) * | 1983-10-21 | 1985-05-20 | 富士写真フイルム株式会社 | flexible desk jacket |
| US4648002A (en) * | 1984-10-12 | 1987-03-03 | Verbatim Corporation | Wiping system for magnetic recording disks |
| JPS61147017A (en) * | 1984-12-19 | 1986-07-04 | Matsushita Electric Ind Co Ltd | Controlling device for combustion ratio |
| KR940005563B1 (en) * | 1985-03-14 | 1994-06-20 | 히다찌 마구세루 가부시기가이샤 | Disc carridge |
| DE8516550U1 (en) * | 1985-06-07 | 1985-08-08 | Basf Ag, 6700 Ludwigshafen | Protective cover |
| JPH01146375U (en) * | 1988-03-31 | 1989-10-09 | ||
| JPH0636546Y2 (en) * | 1989-01-19 | 1994-09-21 | 花王株式会社 | Magnetic disk cartridge |
| JP2955603B2 (en) * | 1989-11-28 | 1999-10-04 | ティーディーケイ株式会社 | Disk cartridge |
-
1990
- 1990-08-08 JP JP1990083253U patent/JPH0445382U/ja active Pending
-
1991
- 1991-08-02 GB GB9116693A patent/GB2246903A/en not_active Withdrawn
- 1991-08-05 US US07/740,316 patent/US5282106A/en not_active Expired - Fee Related
- 1991-08-07 CA CA002048579A patent/CA2048579A1/en not_active Abandoned
- 1991-08-08 DE DE4126304A patent/DE4126304A1/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| GB9116693D0 (en) | 1991-09-18 |
| US5282106A (en) | 1994-01-25 |
| DE4126304A1 (en) | 1992-02-13 |
| GB2246903A (en) | 1992-02-12 |
| JPH0445382U (en) | 1992-04-17 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |